Merge PDF
Combine multiple PDF files into one document. Free, fast, and private, no uploads.
How to use
- 1Drop PDF files or click to browse.
- 2Reorder files as needed.
- 3Download merged PDF.
How to Merge PDF Files
- 1Upload your PDF files by dragging them or clicking the upload area.
- 2Arrange the files in the order you want them merged.
- 3Download your merged PDF file instantly.
Why Merge PDFs?
Combine documents, Merge invoices, receipts, or reports into a single file for easier sharing and archiving.
Organize your files, Keep related PDFs together in one document instead of managing multiple separate files.
100% private, Your files are processed entirely in your browser and never uploaded to any server.
How merging works in your browser
We use pdf-lib to import each file's page tree and write a fresh document containing the same page objects not screenshots. Text stays selectable, fonts stay embedded, forms may flatten check if you rely on fillable fields.
Merge vs keep separate
Merge when a single send or print matters: report + receipts, deck + appendix. Keep separate when per-file commenting or signatures must stay isolated. A merged PDF has one pagination convenient for archiving, but loses per-file versioning.
Clean pagination tips
If inputs mix A4 and Letter, normalize first. Remove stray blanks in thumbnails before merging. On phones, batch merges of 20 files keep memory safe.
Frequently Asked Questions
Uploaded anywhere?
No pdf-lib runs locally.
Searchable after?
Yes for digital PDFs; scanned pages stay images.
Forms preserved?
Often flattened verify interactive fields.
Quick Answer
Drop many PDFs, reorder by drag, and download one combined PDF. No upload, thumbnails and order are local.
What is this tool?
Merge PDF combines many PDF files into one. You have several reports or chapters as separate PDFs and want one file to send or print. You need this for portfolios, onboarding packets, or combining scans. Our tool reads each PDF locally with pdf-lib, keeps the order you drag, and writes a new PDF with all pages in that order, all in your browser so files never leave your device.
How it works
We use pdf-lib, pdfjs-dist, mammoth, and SheetJS locally. Files are read via FileReader into memory, parsed, and a new file is written. For PDFs we keep or reorder page dictionaries, for Word/Excel we map styles to PDF. All happens in your browser no upload with thumbnail previews where helpful. Very large files or 200+ pages may hit phone memory, so split first if needed.
How to use 4 steps
- 1Drop your file(s) onto the box.
- 2Pick pages, ranges, or options as shown.
- 3Preview thumbnails and order.
- 4Click Download and verify opens in Preview/Acrobat.
Specs & formulas
| Item | Detail |
|---|---|
| Lib | pdf-lib / pdfjs-dist / mammoth / SheetJS |
| Privacy | Local, no server |
| Pages | Thumbnails with drag |
| Size | Shown before/after |
Quick reference
3 worked examples
1. Packet
Three reports as three PDFs → one PDF to email.
Merge in order 2,1,3 → one file
2. Extract
50-page PDF, need pages 5-10.
Split range 5-10 → 6-page PDF
3. Fix scan
Pages 4-5 sideways.
Rotate 90° → readable
Mistakes to avoid
- Uploading private PDFs to cloud ours stays local, but close tab on shared device.
- Expecting perfect Word from scanned PDF needs OCR.
- Very large PDFs on phone split first.
Pro tips
- Check thumbnails after import.
- Keep original and work on copy.
- Verify exported PDF in Acrobat/Preview before sending.
When to use it
Contracts, invoices, research drafts, and class packets that need combining, splitting, cleaning, or compressing before sharing, all privately and fast.
Frequently Asked Questions
Are PDFs uploaded?
No processed with pdf-lib locally. Close tab to clear.
Will formatting survive Word?
Headings and lists mostly yes; scanned pages are images.
How much save on compress?
Text 20-60%, scans depend on DPI.
Can I reorder?
Yes drag thumbnails to new order.
Limit?
Large files may hit phone memory split first.